Hmmm... I guess China and Russia... Not sure though. They seem like they might make a cute couple, but I don't really ship many ヘタリア pairings, except for JapanxGreenland, my OC. :3
i have a feeling lots of people have mentioned USxUK(damn that pairing! they're brothers! blah incest) so my favourite pairing it FrUK! i have others but this is my fav